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In 2007, Cynthia Carroll, the newly-appointed chief executive of mining giant Anglo American, was considering shutting down mines in South Africa for safety reasons, namely worker fatalities. No company had ever done so before. Carroll felt that operating a company whose goal was anything less than "zero harm" (meaning no fatalities or serious injuries) was unacceptable. As the first woman and non-South African to lead the century-old company, many were watching her closely. Should she go so far as to make the unprecedented move of shutting down the mines? What message would that send to the company and to the mining industry? The lives of others, Carroll's reputation, and the company's performance were all on the line.

For over half a century, most of the world's economies have enjoyed steady growth and prosperity. However, beginning in the 1980s, and continuing essentially unabated to the present, the gap between the "haves" and the "have-nots" in developed countries has widened, with a small proportion of the population reaping an increasingly larger share of a country's economic rewards. This growing economic inequality has been particularly pronounced in the United States, but the phenomenon has also occurred in many nations, among them Germany, Japan and Sweden.

This note provides background on aspects of economic inequality. It begins by describing both income inequality and wealth inequality, providing an explanation of two widely used metrics and data that show increasing inequalities over time. It then moves to the factors that might contribute to this inequality, as well as to propositions of economic and social consequences that might result from the widening gap. Finally, it addresses the issue of "equality of opportunity" or social mobility.